body {
  margin: 0;
  font-family: sans-serif;
}

div#buttonContainer {
  padding: 8px;
  transition: filter 1s;
  max-height: 100vh;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-evenly;
  flex-direction: column;
  align-items: center;
}

div#offlineDiv {
  position: fixed;
  margin: 0;
  padding: 16px;
  bottom: 0;
  width: 100%;
  text-align: center;
  background-color: #EEE;
  box-shadow: 0px -2px 5px #ccc;
  box-sizing: border-box;
}

div#offlineDiv>button {
  display: block;
  margin: 6px auto;
}

/* https://www.w3schools.com/howto/howto_css_switch.asp */

.switch {
  position: relative;
  display: block;
  width: 60px;
  height: 34px;
  margin: auto 12px;
}

.switch input {display:none;}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}

input:checked + .slider {
  background-color: #2196F3;
}

input:focus + .slider {
  box-shadow: 0 0 1px #2196F3;
}

input:checked + .slider:before {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
}

/* Rounded sliders */
.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}